NeverTileDiscardPolicy

A TileDiscardPolicy specifying that tile images should never be discard.

<static> prototype.isReady

Determines if the discard policy is ready to process images.

True if the discard policy is ready to process images; otherwise, false.

<static> prototype.shouldDiscardImage

Given a tile image, decide whether to discard that image.

Name	Type	Description
`image`	Image \| Promise	An image, or a promise that will resolve to an image.

A promise that will resolve to true if the tile should be discarded.